NITROGEN CYCLE

Multiple Choice

Explain how bacteria play a role in the nitrogen cycle.

• Bacteria are responsible for photosynthesis in plants.
• Bacteria play a crucial role in the nitrogen cycle by fixing atmospheric nitrogen, nitrifying ammonia, and denitrifying nitrates.
• Bacteria convert sulfur into nitrogen compounds.
• Bacteria decompose organic matter into carbon dioxide.

Multiple Choice

Why is the nitrogen cycle important for life on Earth?

• It helps recycle water

• It makes nitrogen available to living organisms

• It produces oxygen for breathing

• It controls the weather

Multiple Select

Which of the following are methods by which nitrogen fixation occurs in the nitrogen cycle?

• Biological fixation by bacteria

• Atmospheric fixation by lightning

• Industrial fixation via the Haber-Bosch process

• Assimilation by plants

Multiple Choice

Which process in the nitrogen cycle is primarily responsible for converting atmospheric nitrogen (N2) into a usable form for plants?

• Nitrogen Fixation

• Assimilation

• Nitrification

• Denitrification

Multiple Choice

During assimilation in the nitrogen cycle, how do animals obtain nitrogen?

• By absorbing it from the soil

• By eating plants or other animals

• By breathing it from the air

• By decomposing organic matter

Fill in the Blanks

When organisms die, decomposers break down their organic nitrogen compounds back into inorganic

in the soil.

Multiple Choice

Explain the importance of nitrification and denitrification in maintaining the balance of the nitrogen cycle.

• Nitrification increases nitrogen levels in water bodies.
• Denitrification is the process of nitrogen fixation in plants.
• Nitrification and denitrification have no impact on soil health.
• Nitrification and denitrification are crucial for maintaining nitrogen balance, supporting plant growth, and preventing environmental pollution.

Multiple Choice

How do human activities impact the nitrogen cycle, and what are some potential consequences of these impacts on ecosystems?

• Nitrogen cycle is unaffected by human activities, maintaining natural balance.
• Human activities enhance the nitrogen cycle, leading to healthier ecosystems.
• Human activities only increase nitrogen levels without any ecological consequences.
• Human activities disrupt the nitrogen cycle, causing nutrient pollution, algal blooms, and biodiversity loss in ecosystems.

Multiple Choice

Which of the following processes in the nitrogen cycle is primarily responsible for converting atmospheric nitrogen (N2) into a form usable by plants?

• Assimilation

• Denitrification

• Nitrogen fixation

• Nitrification